In which the students arrive at Hogwarts in a gale, are soaked by
Peeves' water balloons, the First Years are sorted, and Hermione
discovers that there are house elves at Hogwarts. Moody is the new
DADA teacher, Dumbledore announces the Triwizard Tournament, and
Fred and George decide to enter despite being underage.

Interesting facts and notes about the text of this chapter:

The main event of this chapter is Dumbledore's speech at the Welcoming Feast,
in which he reveals that the Triwizard Tournament will be held at Hogwarts
during the coming year, and tells the students (and the reader) something about
it.

"We're seventeen in April, why can't we have a shot?"

In fact, the Weasley twins' birthday is the first of April - April Fools' Day
(JKR).

Dennis Creevey, who (as Harry observes) reacts as though nobody could hope for
more than to be tossed into a bitterly cold, fathoms-deep lake during a storm
and then helped out of it by a giant sea monster.

Hermione Granger's
short-lived hunger strike, in protest of the fact that Hogwarts has
house-elves on staff in a traditional manner.